752 lines
28 KiB
HTML
752 lines
28 KiB
HTML
---
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layout: default
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title: Select2 4.0.0 Released
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slug: announcements-4.0
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---
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<section id="pre-release" class="jumbotron">
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<div class="container">
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<h1>Announcing Select2 4.0.0</h1>
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</div>
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</section>
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<div class="container s2-docs-container">
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<div class="row">
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<div class="col-md-9" role="main">
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<section id="release">
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<h1 class="page-header">Select2 4.0.0</h1>
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<p class="lead">
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The 4.0 release of Select2 is the result of three years of working on the
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code base and watching where it needs to go. At the core, it is a full
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rewrite that addresses many of the extensibility and usability problems
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that could not be addressed in previous versions.
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</p>
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<p>
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This release contains many breaking changes, but easy-upgrade paths have
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been created as well as helper modules that will allow for backwards
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compatibility to be maintained with past versions of Select2. Upgrading
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<em>will</em> require you to read the release notes carefully, but the
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migration path should be relatively straightforward. You can view a list
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of the most common changes that you will need to make
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<a href="https://github.com/select2/select2/releases">in the release notes</a>.
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</p>
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<p>
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Below is an in-depth review of what is new in Select2, as well as some of
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the major changes that have been made.
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</p>
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</section>
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<section id="new">
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<h2>New features</h2>
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<p>
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The notable features of this new release include:
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</p>
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<ul>
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<li>
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A more flexible plugin framework that allows you to override Select2 to
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behave exactly how you want it to.
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</li>
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<li>
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Consistency with standard <code><select></code> elements for all
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data adapters, removing the need for hidden <code><input></code>
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elements.
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</li>
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<li>
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A new build system that uses AMD to keep everything organized.
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</li>
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<li>
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Less specific selectors allowing for Select2 to be styled to fit the
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rest of your application.
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</li>
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</ul>
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</section>
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<section id="plugins">
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<h2>Plugin system</h2>
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<p>
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Select2 now provides interfaces that allow for it to be easily extended,
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allowing for anyone to create a plugin that changes the way Select2 works.
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This is the result of Select2 being broken into four distinct sections,
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each of which can be extended and used together to create your unique
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Select2.
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</p>
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<p>
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The adapters implement a consistent interface that is documented in the
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<a href="options.html#adapters">options section for adapters</a>, allowing
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you to customize Select2 to do exactly what you are looking for. Select2
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is designed such that you can mix and match plugins, with most of the core
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options being built as decorators that wrap the standard adapters.
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</p>
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</section>
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<section id="amd-builds">
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<h2>AMD-based build system</h2>
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<p>
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Select2 now uses an
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<a href="https://en.wikipedia.org/wiki/Asynchronous_module_definition">AMD-based build system</a>,
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allowing for builds that only require the parts of Select2 that you need.
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While a custom build system has not yet been created, Select2 is open
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source and will gladly accept a pull request for one.
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</p>
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<p>
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Select2 includes the minimal <a href="https://github.com/jrburke/almond">almond</a>
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AMD loader, but a custom <code>select2.amd.js</code> build is available
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if you already use an AMD loader. The code base (available in the
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<code>src</code> directory) also uses AMD, allowing you to include Select2
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in your own build system and generate your own builds alongside your
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existing infrastructure.
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</p>
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<p>
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The AMD methods used by Select2 are available as
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<code>jQuery.fn.select2.amd.define()/require()</code>, allowing you to use the
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included almond loader. These methods are primarily used by the
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translations, but they are the recommended way to access custom modules
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that Select2 provides.
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</p>
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</section>
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<section id="migrating">
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<h1>Migrating from Select2 3.5</h1>
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<p>
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There are a few breaking changes that migrators should be aware of when
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they are coming from older versions of Select2.
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</p>
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<p>
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If you use the full build of Select2 (<code>select2.full.js</code>), you
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will be automatically notified of the major breaking changes, and
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compatibility modules will be used in some cases to ensure that your code
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still behaves how you were expecting.
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</p>
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<h2 id="hidden-input">No more hidden input tags</h2>
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<p>
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In past versions of Select2, an <code><input type="hidden" /></code>
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tag was recommended if you wanted to do anything advanced with Select2,
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such as work with remote data sources or allow users to add their own
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tags. This had the unfortunate side-effect of servers not receiving the
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data from Select2 as an array, like a standard <code><select></code>
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element does, but instead sending a string containing the comma-separated
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strings. The code base ended up being littered with special cases for the
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hidden input, and libraries using Select2 had to work around the
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differences it caused.
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</p>
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<p>
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In Select2 4.0, the <code><select></code> element supports all core
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options, and support for the old
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<code><input type="hidden" /></code> has been deprecated. This means
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that if you previously declared an AJAX field with some pre-selected
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options that looked like…
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</p>
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{% highlight html linenos %}
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<input type="hidden" name="select-boxes" value="1,2,4,6" />
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{% endhighlight %}
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<p>
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It will need to be recreated as a <code><select></code> element with
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some <code><option></code> tags that have <code>value</code>
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attributes that match the old value.
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</p>
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{% highlight html linenos %}
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<select name="select-boxes" multiple="multiple">
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<option value="1" selected="selected">Select2</option>
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<option value="2" selected="selected">Chosen</option>
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<option value="4" selected="selected">selectize.js</option>
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<option value="6" selected="selected">typeahead.js</option>
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</select>
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{% endhighlight %}
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<p>
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The options that you create should have <code>selected="selected"</code>
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set so Select2 and the browser knows that they should be selected. The
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<code>value</code> attribute of the option should also be set to the value
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that will be returned from the server for the result, so Select2 can
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highlight it as selected in the dropdown. The text within the option
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should also reflect the value that should be displayed by default for the
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option.
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</p>
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<h2 id="new-matcher">Advanced matching of searches</h2>
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<p>
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In past versions of Select2, when matching search terms to individual
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options, which limited the control that you had when displaying results,
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especially in cases where there was nested data. The <code>matcher</code>
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function was only given the individual option, even if it was a nested
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options, without any context.
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</p>
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<p>
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With the new matcher function, only the root-level options are matched and
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matchers are expected to limit the results of any children options that
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they contain. This allows developers to customize how options within
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groups can be displayed, and modify how the results are returned.
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</p>
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<p>
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A function has been created that allows old-style matcher functions to be
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converted to the new style. You can retrieve the function from the
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<code>select2/compat/matcher</code> module, which should just wrap the old
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matcher function.
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</p>
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<p>
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So if your old code used a matcher that only displayed options if they
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started with the term that was entered, it would look something like…
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</p>
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{% highlight js linenos %}
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function matchStart (term, text) {
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if (text.toUpperCase().indexOf(term.toUpperCase()) == 0) {
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return true;
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}
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return false;
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}
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$("select").select2({
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matcher: matchStart
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})
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{% endhighlight %}
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<p>
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Then in Select2 4.0, you would need to wrap the <code>matchStart</code>
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method (or the name of the matcher you created) with a
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<code>oldMatcher</code> method that we have created.
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</p>
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{% highlight js linenos %}
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function matchStart (term, text) {
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if (text.toUpperCase().indexOf(term.toUpperCase()) == 0) {
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return true;
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}
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return false;
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}
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$.fn.select2.amd.require(['select2/compat/matcher'], function (oldMatcher) {
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$("select").select2({
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matcher: oldMatcher(matchStart)
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})
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});
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{% endhighlight %}
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<p>
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This will work for any matchers that only took in the search term and the
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text of the option as parameters. If your matcher relied on the third
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parameter containing the jQuery element representing the original
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<code><option></code> tag, then you may need to slightly change
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your matcher to expect the full JavaScript data object being passed in
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instead. You can still retrieve the jQuery element from the data object
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using the <code>data.element</code> property.
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</p>
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<h2 id="flexible-placeholders">More flexible placeholders</h2>
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<p>
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In the most recent versions of Select2, placeholders could only be
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applied to the first (typically the default) option in a
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<code><select></code> if it was blank. The
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<code>placeholderOption</code> option was added to Select2 to allow users
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using the <code>select</code> tag to select a different option, typically
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an automatically generated option with a different value.
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</p>
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<p>
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The <code>placeholder</code> option can now take an object as well as just
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a string. This replaces the need for the old
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<code>placeholderOption</code>, as now the <code>id</code> of the object
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can be set to the <code>value</code> attribute of the
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<code><option></code> tag.
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</p>
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<p>
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For a select that looks like the following, where the first option (with a
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value of <code>-1</code>) is the placeholder option…
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</p>
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{% highlight html linenos %}
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<select>
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<option value="-1" selected="selected">Select an option</option>
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<option value="1">Something else</option>
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</select>
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{% endhighlight %}
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<p>
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You would have previously had to get the placeholder option through the
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<code>placeholderOption</code>, but now you can do it through the
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<code>placeholder</code> option by setting an <code>id</code>.
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</p>
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{% highlight js linenos %}
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$("select").select2({
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placeholder: {
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id: "-1",
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placeholder: "Select an option"
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}
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})
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{% endhighlight %}
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<p>
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And Select2 will automatically display the placeholder when the value of
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the select is <code>-1</code>, which it will be by default. This does not
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break the old functionality of Select2 where the placeholder option was
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blank by default.
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</p>
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<h2 id="value-ordering">Display reflects the actual order of the values</h2>
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<p>
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In past versions of Select2, choices were displayed in the order that
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they were selected. In cases where Select2 was used on a
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<code><select></code> element, the order that the server received
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the selections did not always match the order that the choices were
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displayed, resulting in confusion in situations where the order is
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important.
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</p>
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<p>
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Select2 will now order selected choices in the same order that will be
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sent to the server.
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</p>
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<h2 id="changed-options">Changed method and option names</h2>
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<p>
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When designing the future option set for Select2 4.0, special care was
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taken to ensure that the most commonly used options were brought over.
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For the most part, the commonly used options of Select2 can still be
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referenced under their previous names, but there were some changes which
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have been noted.
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</p>
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<h3 id="removed-initselection">
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Removed the requirement of <code>initSelection</code>
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</h3>
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<p>
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In the past, whenever you wanted to use a custom data adapter, such as
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AJAX or tagging, you needed to help Select2 out in determining the initial
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values that were selected. This was typically done through the
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<code>initSelection</code> option, which took the underlying data of the
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input and converted it into data objects that Select2 could use.
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</p>
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<p>
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This is now handled by
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<a href="options.html#dataAdapter">the data adapter</a> in the
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<code>current</code> method, which allows Select2 to convert the currently
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selected values into data objects that can be displayed. The default
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implementation converts the text and value of <code>option</code> elements
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into data objects, and is probably suitable for most cases. An example of
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the old <code>initSelection</code> option is included below, which
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converts the value of the selected options into a data object with both
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the <code>id</code> and <code>text</code> matching the selected value.
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</p>
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{% highlight js linenos %}
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{
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initSelection : function (element, callback) {
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var data = [];
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$(element.val()).each(function () {
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data.push({id: this, text: this});
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});
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callback(data);
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}
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}
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{% endhighlight %}
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<p>
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When using the new <code>current</code> method of the custom data adapter,
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<strong>this method is called any time Select2 needs a list</strong> of
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the currently selected options. This is different from the old
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<code>initSelection</code> in that it was only called once, so it could
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suffer from being relatively slow to process the data (such as from a
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remote data source).
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</p>
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{% highlight js linenos %}
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$.fn.select2.amd.require([
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'select2/data/array',
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'select2/utils'
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], function (ArrayData, Utils) {
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function CustomData ($element, options) {
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CustomData.__super__.constructor.call(this, $element, options);
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}
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Utils.Extend(CustomData, ArrayData);
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CustomData.prototype.current = function (callback) {
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var data = [];
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var currentVal = this.$element.val();
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if (!this.$element.prop('multiple')) {
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currentVal = [currentVal];
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}
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for (var v = 0; v < currentVal.length; v++) {
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data.push({
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id: currentVal[v],
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text: currentVal[v]
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});
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}
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callback(data);
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};
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$("#select").select2({
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dataAdapter: CustomData
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});
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}
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{% endhighlight %}
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<p>
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The new <code>current</code> method of the data adapter works in a similar
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way to the old <code>initSelection</code> method, with three notable
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differences. The first, and most important, is that <strong>it is called
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whenever the current selections are needed</strong> to ensure that Select2
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is always displaying the most accurate and up to date data. No matter
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what type of element Select2 is attached to, whether it supports a
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single or multiple selections, the data passed to the callback
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<strong>must be an array, even if it contains one selection</strong>.
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The last is that there is only one parameter, the callback to be
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executed with the latest data, and the current element that Select2 is
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attached to is available on the class itself as
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<code>this.$element</code>.
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</p>
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<p>
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If you only need to load in the initial options once, and otherwise will
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be letting Select2 handle the state of the selections, you don't need to
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use a custom data adapter. You can just create the
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<code><option></code> tags on your own, and Select2 will pick up
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the changes.
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</p>
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{% highlight js linenos %}
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var $element = $('select').select2(); // the select element you are working with
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var $request = $.ajax({
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url: '/my/remote/source' // wherever your data is actually coming from
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});
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$request.then(function (data) {
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// This assumes that the data comes back as an array of data objects
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// The idea is that you are using the same callback as the old `initSelection`
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for (var d = 0; d < data.length; d++) {
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var item = data[d];
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// Create the DOM option that is pre-selected by default
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var option = new Option(item.text, item.id, true, true);
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// Append it to the select
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$element.append(option);
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}
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// Update the selected options that are displayed
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$element.trigger('change');
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});
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{% endhighlight %}
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<h3 id="query-to-data-adapter">
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Custom data adapters instead of <code>query</code>
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</h3>
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<p>
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<a href="http://select2.github.io/select2/#data">In the past</a>, any time
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you wanted to hook Select2 up to a different data source you would be
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required to implement custom <code>query</code> and
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<code>initSelection</code> methods. This allowed Select2 to determine the
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initial selection and the list of results to display, and it would handle
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everything else internally, which was fine more most people.
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</p>
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<p>
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The custom <code>query</code> and <code>initSelection</code> methods have
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been replaced by
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<a href="options.html#dataAdapter">custom data adapters</a> that handle
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how Select2 stores and retrieves the data that will be displayed to the
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user. An example of the old <code>query</code> option is provided below,
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which is
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<a href="http://select2.github.io/select2/#data">the same as the old example</a>,
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and it generates results that contain the search term repeated a certain
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number of times.
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</p>
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{% highlight js linenos %}
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{
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query: function (query) {
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var data = {results: []}, i, j, s;
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for (i = 1; i < 5; i++) {
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s = "";
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for (j = 0; j < i; j++) {s = s + query.term;}
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data.results.push({id: query.term + i, text: s});
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}
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query.callback(data);
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}
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}
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{% endhighlight %}
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<p>
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This has been replaced by custom data adapters which define a similarly
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named <code>query</code> method. The comparable data adapter is provided
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below as an example.
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</p>
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|
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{% highlight js linenos %}
|
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$.fn.select2.amd.require([
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'select2/data/array',
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'select2/utils'
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], function (ArrayData, Utils) {
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function CustomData ($element, options) {
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CustomData.__super__.constructor.call(this, $element, options);
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}
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|
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Utils.Extend(CustomData, ArrayData);
|
|
|
|
CustomData.prototype.query = function (params, callback) {
|
|
var data = {
|
|
results: []
|
|
};
|
|
|
|
for (var i = 1; i < 5; i++) {
|
|
var s = "";
|
|
|
|
for (var j = 0; j < i; j++) {
|
|
s = s + params.term;
|
|
}
|
|
|
|
data.results.push({
|
|
id: params.term + i,
|
|
text: s
|
|
});
|
|
}
|
|
|
|
callback(data);
|
|
};
|
|
|
|
$("#select").select2({
|
|
dataAdapter: CustomData
|
|
});
|
|
}
|
|
{% endhighlight %}
|
|
|
|
<p>
|
|
The new <code>query</code> method of the data adapter is very similar to
|
|
the old <code>query</code> option that was passed into Select2 when
|
|
initializing it. The old <code>query</code> argument is mostly the same as
|
|
the new <code>params</code> that are passed in to query on, and the
|
|
callback that should be used to return the results is now passed in as the
|
|
second parameter.
|
|
</p>
|
|
|
|
<h3 id="changed-templating">Renamed templating options</h3>
|
|
|
|
<p>
|
|
Select2 previously provided multiple options for formatting the results
|
|
list and selected options, commonly referred to as "formatters", using the
|
|
<code>formatSelection</code> and <code>formatResult</code> options. As the
|
|
"formatters" were also used for things such as localization,
|
|
<a href="#changed-translations">which has also changed</a>, they have been
|
|
renamed to <code>templateSelection</code> and <code>templateResult</code>
|
|
and their signatures have changed as well.
|
|
</p>
|
|
|
|
<p>
|
|
You should refer to the updated
|
|
<a href="options.html#templating">documentation on templates</a> when
|
|
migrating from previous versions of Select2.
|
|
</p>
|
|
|
|
<h3 id="changed-id">
|
|
The <code>id</code> and <code>text</code> properties are strictly enforced
|
|
</h3>
|
|
|
|
<p>
|
|
When working with array and AJAX data in the past, Select2 allowed a
|
|
custom <code>id</code> function or attribute to be set in various places,
|
|
ranging from the initialization of Select2 to when the remote data was
|
|
being returned. This allowed Select2 to better integrate with existing
|
|
data sources that did not necessarily use the <code>id</code> attribute to
|
|
indicate the unique identifier for an object.
|
|
</p>
|
|
|
|
<p>
|
|
Select2 no longer supports a custom <code>id</code> or <code>text</code>
|
|
to be used, but provides integration points for converting incorrect data
|
|
to the expected format.
|
|
</p>
|
|
|
|
<h4>
|
|
When working with array data
|
|
</h4>
|
|
|
|
<p>
|
|
Select2 previously supported defining array data as an object that matched
|
|
the signature of an AJAX response. A <code>text</code> property could be
|
|
specified that would map the given property to the <code>text</code>
|
|
property on the individual objects. You can now do this when initializing
|
|
Select2 by using the following jQuery code to map the old
|
|
<code>text</code> and <code>id</code> properties to the new ones.
|
|
</p>
|
|
|
|
{% highlight js linenos %}
|
|
var data = $.map([
|
|
{
|
|
pk: 1,
|
|
word: 'one'
|
|
},
|
|
{
|
|
pk: 2,
|
|
word: 'two'
|
|
}
|
|
], function (obj) {
|
|
obj.id = obj.id || obj.pk;
|
|
obj.text = obj.text || obj.word;
|
|
|
|
return obj;
|
|
});
|
|
{% endhighlight %}
|
|
|
|
<p>
|
|
This will result in an array of data objects that have the <code>id</code>
|
|
properties that match the existing <code>pk</code> properties and
|
|
<code>text</code> properties that match the existing <code>word</code>
|
|
properties.
|
|
</p>
|
|
|
|
<h4>
|
|
When working with remote data
|
|
</h4>
|
|
|
|
<p>
|
|
The same code that was given above can be used in the
|
|
<code>processResults</code> method of an AJAX call to map properties there
|
|
as well.
|
|
</p>
|
|
|
|
<h3 id="changed-translations">Renamed translation options</h3>
|
|
|
|
<p>
|
|
In previous versions of Select2, the default messages provided to users
|
|
could be localized to fit the language of the website that it was being
|
|
used on. Select2 only comes with the English language by default, but
|
|
provides
|
|
<a href="options.html#language">community-contributed translations</a> for
|
|
many common languages. Many of the formatters have been moved to the
|
|
<code>language</code> option and the signatures of the formatters have
|
|
been changed to handle future additions.
|
|
</p>
|
|
|
|
<h3 id="changed-data">
|
|
Declaring options using <code>data-*</code> attributes
|
|
</h3>
|
|
|
|
<p>
|
|
In the past, Select2 has only supported declaring a subset of options
|
|
using <code>data-*</code> attributes. Select2 now supports declaring all
|
|
options using the attributes, using
|
|
<a href="options.html#data-attributes">the format specified in the documentation</a>.
|
|
</p>
|
|
|
|
<p>
|
|
You could previously declare the URL that was used for AJAX requests using
|
|
the <code>data-ajax-url</code> attribute. While Select2 still allows for
|
|
this, the new attribute that should be used is the
|
|
<code>data-ajax--url</code> attribute. Support for the old attribute will
|
|
be removed in Select2 4.1.
|
|
</p>
|
|
|
|
<p>
|
|
Although it was not documented, a list of possible tags could also be
|
|
provided using the <code>data-select2-tags</code> attribute and passing in
|
|
a JSON-formatted array of objects for tags. As the method for specifying
|
|
tags has changed in 4.0, you should now provide the array of objects using
|
|
the <code>data-data</code> attribute, which maps to
|
|
<a href="options.html#data">the array data</a> option. You should also
|
|
enable tags by setting <code>data-tags="true"</code> on the object, to
|
|
maintain the ability for users to create their own options as well.
|
|
</p>
|
|
|
|
<p>
|
|
If you previously declared the list of tags as…
|
|
</p>
|
|
|
|
{% highlight html linenos %}
|
|
<select data-select2-tags='[{"id": "1", "text": "One"}, {"id": "2", "text": "Two"}]'></select>
|
|
{% endhighlight %}
|
|
|
|
<p>
|
|
…then you should now declare it as…
|
|
</p>
|
|
|
|
{% highlight html linenos %}
|
|
<select data-data='[{"id": "1", "text": "One"}, {"id": "2", "text": "Two"}]' data-tags="true"></select>
|
|
{% endhighlight %}
|
|
|
|
<h2 id="removed-methods">Deprecated and removed methods</h2>
|
|
|
|
<p>
|
|
As Select2 now uses a <code><select></code> element for all data
|
|
sources, a few methods that were available by calling
|
|
<code>.select2()</code> are no longer required.
|
|
</p>
|
|
|
|
<h3>.select2("val")</h3>
|
|
|
|
<p>
|
|
The <code>"val"</code> method has been deprecated and will be removed in
|
|
Select2 4.1. The deprecated method no longer includes the
|
|
<code>triggerChange</code> parameter.
|
|
</p>
|
|
|
|
<p>
|
|
You should directly call <code>.val</code> on the underlying
|
|
<code><select></code> element instead. If you needed the second
|
|
parameter (<code>triggerChange</code>), you should also call
|
|
<code>.trigger("change")</code> on the element.
|
|
</p>
|
|
|
|
{% highlight js linenos %}
|
|
$("select").val("1").trigger("change"); // instead of $("select").select2("val", "1");
|
|
{% endhighlight %}
|
|
|
|
<h3>.select2("enable")</h3>
|
|
|
|
<p>
|
|
Select2 will respect the <code>disabled</code> property of the underlying
|
|
select element. In order to enable or disable Select2, you should call
|
|
<code>.prop('disabled', true/false)</code> on the
|
|
<code><select></code> element. Support for the old methods will be
|
|
completely removed in Select2 4.1.
|
|
</p>
|
|
|
|
{% highlight js linenos %}
|
|
$("select").prop("disabled", true); // instead of $("select").enable(false);
|
|
{% endhighlight %}
|
|
|
|
</section>
|
|
</div>
|
|
<div class="col-md-3" role="complementary">
|
|
|
|
{% include nav/announcements-4.0.html %}
|
|
|
|
</div>
|
|
</div>
|
|
</div> |